Skip integration tests when Swift is not available

Let's skip integration tests using Swift when the service is not
available. It will help turn the py3 gate green.

Change-Id: Ib3536583dbb3bbf50d9c64976e909fd352391d05
diff --git a/functional/test_aws_stack.py b/functional/test_aws_stack.py
index 1241d22..05539dc 100644
--- a/functional/test_aws_stack.py
+++ b/functional/test_aws_stack.py
@@ -72,6 +72,8 @@
 
     def setUp(self):
         super(AwsStackTest, self).setUp()
+        if not self.is_service_available('object-store'):
+            self.skipTest('object-store service not available, skipping')
         self.object_container_name = test.rand_name()
         self.project_id = self.identity_client.project_id
         self.swift_key = hashlib.sha224(
diff --git a/functional/test_swiftsignal_update.py b/functional/test_swiftsignal_update.py
index 0cf2f81..9e656b1 100644
--- a/functional/test_swiftsignal_update.py
+++ b/functional/test_swiftsignal_update.py
@@ -34,6 +34,8 @@
 class SwiftSignalHandleUpdateTest(functional_base.FunctionalTestsBase):
 
     def test_stack_update_same_template_replace_no_url(self):
+        if not self.is_service_available('object-store'):
+            self.skipTest('object-store service not available, skipping')
         stack_identifier = self.stack_create(template=test_template)
         stack = self.client.stacks.get(stack_identifier)
         orig_url = self._stack_output(stack, 'signal_url')